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Renesas R1LP5256ESP-7SI#B0
- Part No.:
- R1LP5256ESP-7SI#B0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-SOIC (0.330", 8.40mm Width)
- Datasheet:
-
R1LP5256ESP-7SI#B0.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,018
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Product details
Overview
R1LP5256ESP-7SI#B0 from Renesas Electronics is a 256Kb low-power static RAM organized as 32,768 × 8-bit, operating on a single 4.5V–5.5V supply with 55 ns access time, 0.6 µA typical standby current at 5.0V, and TTL-compatible I/O-designed for battery-backed memory systems in industrial controllers and portable instrumentation.
For engineers reviewing the R1LP5256ESP-7SI#B0 datasheet, R1LP5256ESP-7SI#B0 pinout, R1LP5256ESP-7SI#B0 application, or R1LP5256ESP-7SI#B0 equivalent, key selection criteria include low-voltage data retention down to 2.0V, no-refresh operation, three-state OR-tie capable outputs, and 28-pin SOP packaging compatible with legacy board layouts.
Technical Context
The R1LP5256ESP-7SI#B0 implements a fully static CMOS memory architecture with no internal clocks or refresh circuitry, relying solely on address decoding and control signal timing (CS#, WE#, OE#) to manage read/write cycles. Its block diagram confirms direct access to a 32k-word × 8-bit memory array via dedicated address buffers, sense/write amplifiers, and output drivers.
All DC and AC timing parameters-including tRC = 55 ns, tAA = 55 ns, tOE = 30 ns, and ISB1 = 0.6 µA at +25°C-are specified across –40°C to +85°C and validated under Vcc = 4.5–5.5V, ensuring deterministic behavior in wide-temperature embedded applications without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32,768 words × 8 bits): supports byte-wide data bus interfacing without external multiplexing. |
| Access time | 55 ns maximum: enables direct connection to microcontrollers with ≤18 MHz bus timing. |
| Supply voltage | 4.5 V to 5.5 V: compatible with standard 5V logic rails and tolerant of ±10% regulation variation. |
| Standby current | 0.6 µA typical at 5.0V/25°C: extends battery life in always-on backup mode for >10 years at room temperature. |
| Data retention Vcc | 2.0 V minimum: maintains stored data during brown-out or battery depletion without external hold-up circuitry. |
| I/O interface | TTL-compatible inputs/outputs with three-state DQ lines: allows direct connection to 5V microcontroller buses and supports bus sharing via OE# control. |
| Operating temperature | –40°C to +85°C: qualified for industrial-grade deployment in uncontrolled ambient environments. |
Pinout & Package
Package: 450-mil 28-pin plastic SOP (Small Outline Package), surface-mount, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Power supply | Primary 4.5–5.5V supply input; decoupling capacitor required within 10 mm for stable operation. |
| Vss (GND) | Ground reference | Common return path for all signals and power; must be connected to system ground plane with low-inductance trace. |
| A0–A14 | Address inputs | 15-bit address bus accepting 0x0000–0x7FFF; latched on CS# low transition for memory location selection. |
| DQ0–DQ7 | Bi-directional data I/O | 8-bit shared data bus; high-impedance when CS# = high or OE# = high, enabling multi-device bus sharing. |
| CS# | Chip select (active-low) | Enables device operation; drives internal buffers into active state only when low-critical for low-power standby control. |
| WE# | Write enable (active-low) | Controls write cycle initiation; low with CS# low and valid address/data to store data into selected location. |
| OE# | Output enable (active-low) | Gates output drivers; prevents bus contention when high, allowing safe read operations alongside other peripherals. |
Key Features
| Feature | Design Value |
|---|---|
| No clock, no refresh | Eliminates timing-critical external clock generation and refresh management logic-reduces BOM count and firmware overhead. |
| Low standby current (0.6 µA) | Enables multi-year battery backup without periodic recharge or replacement in remote sensor nodes and metering devices. |
| OR-tie capability | Three-state outputs allow multiple R1LP5256ESP-7SI#B0 devices to share a common data bus without external bus transceivers. |
| Easy memory expansion | CS#-based chip selection supports daisy-chained or decoded addressing for building larger memory banks up to 512 KB using identical parts. |
| TTL-compatible I/O | Direct interface with legacy 5V microcontrollers (e.g., 8051, PIC18F, MSP430 with level-shifting) without voltage translation circuitry. |
Applications
| Industrial PLC Data Buffer | Medical Device Parameter Storage |
|---|---|
Use Scenario: Storing real-time process variables and alarm history in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Non-volatile data buffer holding last-known state during brief AC power loss, leveraging 2.0V data retention. Use Value: Enables deterministic recovery after brown-out without EEPROM wear-out or SRAM backup capacitor sizing constraints. |
Use Scenario: Retaining calibration coefficients and patient configuration settings in portable ultrasound and ECG monitors powered by Li-ion batteries. IC Role / Device Role / Timing Role: Battery-backed memory maintaining critical settings across sleep/wake cycles and full power-down events. Use Value: Achieves >10-year data retention on coin-cell backup with sub-µA quiescent draw-no periodic refresh interrupts or firmware overhead. |
| Automotive Diagnostic Tool Cache | Smart Energy Meter Firmware Log |
Use Scenario: Caching OBD-II diagnostic trouble codes and live PID streams in handheld vehicle scanners operating from 12V automotive supply with transient suppression. IC Role / Device Role / Timing Role: High-speed, low-latency scratchpad memory supporting burst reads/writes during CAN bus polling intervals. Use Value: 55 ns access time ensures full 8-byte response packets are assembled within one microcontroller instruction cycle at 18 MHz. |
Use Scenario: Logging energy consumption snapshots and tariff switching events in DIN-rail mounted electricity meters with tamper-proof backup power. IC Role / Device Role / Timing Role: Primary non-volatile storage for time-stamped usage records, accessed during daily GSM/GPRS upload windows. Use Value: Eliminates flash endurance limitations (100k cycles) and write latency; supports unlimited write cycles with consistent 55 ns read performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS61LV25616AL-10TLI | 16-bit bus (256K × 16), 10 ns access, 3.3V-only supply, 44-pin TSOP | Higher bandwidth but incompatible voltage and pinout; requires PCB redesign and level-shifting for 5V systems. | Select only if migrating to 3.3V architecture and needing wider data path-R1LP5256ESP-7SI#B0 remains optimal for 5V legacy compatibility. |
| AS6C4008-55PCN | Same 32k × 8 organization, 55 ns access, 4.5–5.5V supply, but 28-pin SOJ package and 2 µA standby current (typ.) | Pin-compatible in function but different physical footprint (SOJ vs. SOP); requires socket or layout change; higher ISB reduces battery life by ~3×. | Acceptable drop-in functional substitute only if SOJ mounting is supported and standby current budget allows 2 µA vs. 0.6 µA. |
Compared with IS61LV25616AL-10TLI and AS6C4008-55PCN, the R1LP5256ESP-7SI#B0 uniquely balances 5V tolerance, ultra-low 0.6 µA standby, SOP packaging, and proven industrial temperature reliability-making it the preferred choice for cost-sensitive, battery-constrained 5V designs requiring long-term data integrity.
Availability
R1LP5256ESP-7SI#B0 is available at Aetrix Electronics and suitable for industrial PLC data buffering, medical device parameter storage, and automotive diagnostic tool caching requiring stable component supply and long-lifecycle support.
Supply support for R1LP5256ESP-7SI#B0 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics Corporation is a global semiconductor leader headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.
The R1LP5256E Series was developed to deliver high-reliability, low-power static RAM for battery-backed and wide-temperature embedded applications where refresh-free operation and long-term data retention are mandatory design requirements.
FAQ
What is the maximum operating frequency supported by the R1LP5256ESP-7SI#B0?
The R1LP5256ESP-7SI#B0 does not operate on a clock signal-it is a static RAM with asynchronous timing. Its 55 ns access time supports reliable interfacing with microcontrollers running at up to 18 MHz (cycle time ≥ 55 ns). System timing depends on external address setup/hold and control signal propagation, not an internal oscillator.
Does the R1LP5256ESP-7SI#B0 require external refresh circuitry?
No, the R1LP5256ESP-7SI#B0 is a true static RAM and requires no refresh cycles or external refresh circuitry. Data retention is maintained indefinitely as long as Vcc remains within specification and CS# is held high during standby-eliminating firmware overhead and timing-critical refresh windows.
Can the R1LP5256ESP-7SI#B0 retain data during complete power loss?
The R1LP5256ESP-7SI#B0 retains data only while Vcc remains ≥ 2.0 V and CS# is held high. It does not retain data during full power loss unless backed by a battery or supercapacitor. For zero-power retention, an external backup source must be implemented per the low-Vcc data retention waveform in the datasheet.
Is the R1LP5256ESP-7SI#B0 pin-compatible with other 28-pin SOP SRAMs like the 62256 series?
The R1LP5256ESP-7SI#B0 uses industry-standard 28-pin SOP pinout (JEDEC MS-012AC) matching 62256-family parts: Vcc (pin 28), GND (pin 14), A0–A14, DQ0–DQ7, CS#, WE#, OE#. However, timing and electrical specs differ-verify tAA, tRC, and ISB before substitution.
What is the meaning of the "-7SI#B0" suffix in R1LP5256ESP-7SI#B0?
The "-7SI#B0" suffix indicates: "7" = 55 ns access speed grade; "S" = SOP package; "I" = industrial temperature range (–40°C to +85°C); "#B0" = assembly revision code per Renesas ordering nomenclature-denoting manufacturing site and process revision, with no functional impact on R1LP5256ESP-7SI#B0 operation.
R1LP5256ESP-7SI#B0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SOIC (0.330", 8.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 70ns
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOP
R1LP5256ESP-7SI#B0 FAQ
1.How can I place an order for R1LP5256ESP-7SI#B0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1LP5256ESP-7SI#B0 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for R1LP5256ESP-7SI#B0 reliable?
The price and inventory of R1LP5256ESP-7SI#B0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1LP5256ESP-7SI#B0 is usually 5 days.
3.What payment methods are accepted for R1LP5256ESP-7SI#B0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1LP5256ESP-7SI#B0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1LP5256ESP-7SI#B0?
R1LP5256ESP-7SI#B0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1LP5256ESP-7SI#B0 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for R1LP5256ESP-7SI#B0?
For technical support, including R1LP5256ESP-7SI#B0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1LP5256ESP-7SI#B0 requirements.
6.How does Aetrix verify that R1LP5256ESP-7SI#B0 is sourced from the original manufacturer or authorized distributors?
All R1LP5256ESP-7SI#B0 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that R1LP5256ESP-7SI#B0 meets industry standards.
7.What is the process for return or replacement of R1LP5256ESP-7SI#B0?
All R1LP5256ESP-7SI#B0 units undergo pre-shipment inspection (PSI). If there is an issue with R1LP5256ESP-7SI#B0, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The R1LP5256ESP-7SI#B0 part is unused and in its original packaging.
Return procedure for R1LP5256ESP-7SI#B0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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